Product details
Weiss Industrial Thermowell | BSS35-75BS | 7.5″ Length | Brass | Extended Neck
Product Description
The BSS35-75BS is a precision-machined protective housing that allows for the safe installation and replacement of industrial thermometers without draining the piping system. The “BSS” designation typically identifies this as a Brass Straight Shank well with a Lagging Extension (Extended Neck). The “35” denotes the 3/4″ NPT process connection, which is the industry standard for mechanical piping.
The “75” indicates an overall length of 7.5 inches (190 mm). Unlike standard 7.5″ wells that house 6″ stems with a small extension, the BSS configuration is often used to accommodate 3.5-inch stem thermometers while providing a massive 4-inch lagging extension (Extended Neck). This design is critical in Dubai and Abu Dhabi for chilled water pipes that require extremely thick insulation to prevent condensation (sweating) in the humid climate.
Key Features
- Extended Lagging Neck: The 4-inch neck clears extra-thick insulation, ensuring the thermometer dial remains visible and accessible above the pipe lagging.
- High Thermal Conductivity: The brass construction allows for rapid heat transfer from the fluid to the thermometer sensor for accurate, real-time readings.
- 5″ Total Length: Provides a balance of deep immersion and external clearance, making it suitable for medium-to-large diameter pipelines.
- Standard 3/4″ NPT Connection: Ensures seamless installation into standard pipe tees and manifolds used in UAE infrastructure projects.
- Instrument Protection: Shields the thermometer stem from bending or damage caused by high-pressure and high-velocity fluid flow.
Technical Specifications
| Specification | Details |
| Brand | Weiss Instruments |
| Model | BSS35-75BS |
| Overall Length | 7.5″ (190 mm) |
| Insertion Length (U) | 3.5″ (90 mm) |
| Lagging Extension (T) | 4″ (100 mm) |
| Material | Brass |
| Stem Design | Straight Shank |
| Process Connection | 3/4″ NPT |
| Internal Thread | 1-1/4″ – 18 UNEF (Industrial Standard) |
| Application | Chilled Water / HVAC / Potable Water |
Frequently Asked Questions
- Q: Why is the extended neck (lagging) necessary?
- A: In the UAE, chilled water pipes are heavily insulated. A standard well would be buried inside the insulation, making the thermometer impossible to read. The extended neck brings the thermometer out past the insulation.
- Q: Which thermometer fits this thermowell?
- A: This well is designed to house any standard industrial thermometer with a 5-inch stem, such as the Weiss A9VU3.5 or 9VBM3.5 series.
- Q: Can this be used for potable water?
- A: This is standard brass. For drinking water systems in the UAE, you should check if the project requires the Lead-Free (LF) version (model BSS35-75BSLF).
